Minelab Equinox 700 vs X-Terra Pro: Is Multi-Frequency Worth the Jump?

One thing, mostly: the ability to tell a salt response from a target response. Salt water is conductive, so a single-frequency machine on wet sand cannot easily distinguish the ground from what is buried in it, and you end up losing sensitivity to keep the machine quiet. Running several frequencies at once and processing the returns together solves that, which is why every serious beach machine is multi-frequency.

The secondary benefit is stability in mineralised ground, where a multi-frequency machine has more information to work with. Neither benefit is a depth claim, and Minelab publishes no depth figure for either detector. On dry inland parks with mild soil, a well-set single-frequency machine and a multi-frequency machine dig very similar holes. The depth chart is a useful corrective if you think the engine is where depth comes from.

Both machines are Minelab, so the listings use the same vocabulary, which makes this an unusually clean comparison.

Seven rows. Notice how few of them are about finding things.

Yes, and this is the strongest practical argument for the X-Terra Pro. Minelab publishes Minelab EQX 06 Coil (6 inch) and Minelab EQX 15 Coil (15 inch) as fitting the Equinox series and the X-Terra Pro, submersible to 16 ft with either body, and Coiltek publishes the same compatibility for Coiltek 10 by 5 NOX Search Coil and Coiltek 15 inch NOX Search Coil. Minelab ML105 Wireless Headphones covers the Manticore, the Equinox 700 and 900 and the X-Terra Pro from one set of headphones.

So the cheaper machine sits inside the same accessory ecosystem as the expensive one. That is rare. It means buying the X-Terra Pro does not trap you, because the coils you buy for it carry over if you later move up to a 700 or a 900. Choose which coil first with the coil size selector, because coil choice changes results more than the price difference between these two machines.

Beach hunters, first and last. If you work wet salt sand or surf, the multi- frequency engine is not a luxury and nothing else in this price range replaces it. Buy it too if your inland soil is genuinely difficult, meaning red clay, black sand or old brick ground where your current machine runs noisy at any usable sensitivity.

And buy it if you want one machine for everything and you would rather not think about frequency selection at all. Multi-IQ is a switch-on-and-hunt proposition, and there is real value in never wondering whether you picked the wrong setting. If that appeals, read the 700 against the 900 before you order, because the coil arithmetic there is worth knowing.

Anyone whose ground is dry and inland, which is most detectorists. Fully waterproof to 16 ft at this price is genuinely unusual, the 30 discrimination segments are quick to notch on a trashy site, and the flashlight, red backlight and vibration make it a serious machine after dark. Put the money you save into Minelab EQX 06 Coil (6 inch) for trashy ground, Garrett Pro-Pointer AT for recovery and LimbSaver Comfort-Tech Metal Detector Sling for hour four.

It is also the better choice for a cautious buyer. Nobody who spends this much on a detector feels obliged to justify it by keeping it, and the coils transfer if you move up later. The beginner setup and intermediate setup both work around a machine at this level.